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An arraignment date has not been set for parents Sierra Butterfield, 21, and Neal Taylor, 29.

Hospital officials called police after treating the boy. Butterfield told detectives her son might have been hurt when his older sister fell on him. Doctors said that would not have caused the boy’s injuries.

Taylor and Butterfield said their son acted “fussy” two days before they brought him to the hospital, refusing food and not urinating.